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• ## Puzzle: What fraction is shaded?0

There’s nothing like a great geometry puzzle to get the Internet into a frenzy.  Ed Southall, author of “Geometry Snacks,” shared a photo of a pink triangle inside of a square and challenged people to figure out how much of the square is shaded pink. Here’s the puzzle: What fraction is shaded? The Solution: According

• ## The Bat and A Ball Problem72

If a baseball and a bat cost \$1.10 together, and the bat costs \$1.00 more than the ball, how much does the ball cost? Was your answer that the ball cost 10 cents? If so, you’d be wrong. Here’s the solution: Although \$1.00 + \$0.10 does equal \$1.10,  if you take \$1.00 – \$0.10 you

• ## The 3 Switches Puzzle (and solution)0

Can you solve the “3 Switches” puzzle? You are in the basement of a house where there are are three identical on-off switches.  One of them controls a lamp in the attic, and two of them do nothing.  You have no way to see into the attic or to see reflected light from the attic.